Lichess Database
From Repertoire Builder
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Lichess is a free and open-source chess platform with a massive game database from players of all levels. Within the Repertoire Builder, the Lichess Database card shows data for the current board position, letting you see which moves are most commonly played, broken down by rating range, time control, and other filters. This helps you understand what opponents at different levels are likely to play and adapt your repertoire accordingly.